Concrete-block mold



Julie 7,1927. 1,631,901

- W. A. THREADGILL CONCRETE BLOCK MOLD Filed Sept. 11. 1926 Y 5 Sheets-Sheet l June 7 192.7.

A. THREADGILL CONCRETE BLOCK MOLD Filed Sept, 11. 1926 3 Sheets-Sheet 2 June 7, 1927. 1,631,901

w. A. THREADGILL concmaws BLOCK MOLD Filed Sept. 11. 1926 3 Sheets-Sheet 3 1%! Earn A. Threzmg zii 66km neg Patented June 7, 1927.

UNITED STATES- WILLIAM A, THREADGILL, OF MIAMI, FLORIDA.

CONCRETE-BLOCK MOLD.

Application filed September 11, 1926. Serial No. 134,914.

My said invention relates to molds for use in the manufacture of concrete and other composite blocks and tiles for building and other purposes, said mold being capable of use with cores of different shapes.

The prim-e object of the invention is to provide a multiple mold of simple, durable, economical and efiicient construction especially designed for enabling the desired blocks and tiles to be readily, quickly and cheaply made by unskilled labor in multiple quantities.

Another object of the invention is to construct my improved mold of thin material, as for example sheet metal, and consisting of a plurality of skeletonforms inside of a box or frame permitting the blocks or tile to be left in position to set-whereupon the skeleton forms may be released and readily removed from the box or frame, leaving the blocks or tiles in place to be cured without removing them from thebox or frame.

A further obj cct of the invention is to provide a box of water-tight construction in r which the skeleton forinsare placed sothat after the blocks ortile are sulliciently set the skeleton forms may be readily removed and the box iilled with water for curing Which will be more efficient and cheaper'than curing in a steam curing room or having to keep the blocks wet by spraying throughout the curing process. 7 Y Y A still further object is to provide a mold the size of which may be varied for producing a desired number of poured concrete blocks and a mold of a construction which will permit the same to be agitated with'theleast effort. 1

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts, f v

Figure 1 is a top plan view of the mold constructed in accordance with my'invention,

Figure 2, a side elevation with part'of the side wall broken away, Figure 3, a detail view,

Figure 4:, a detail on the line 4t-i of Figure 1, 2

Figure 5, a modified form of block,

Figure 6, a modified form of mold used in making the form ofblock shown iii-Figure 5, v

' Figure 7, a modified form of mold for forming a block with a face of different characteristics,

Figures 8, 9 and 10, blocks constructed in accordance with my invention,

Figure 11, a detail of a portion of the mold showing the application ofthe core for producing the blocks of Figures 9 and 10,

Figure 12, a detail perspective of the core member of Figure 11, l

Figure 13, a section on line 1313'0f Figure 12, and

Figure 14, a plan view of the core used in makingthe block of Figure 10.

In the drawings reference character 10 indicates a frame or box of a size suflicient to containa plurality of forms or partition members 11 preferably of relatively thin material such as for example sheet metal or the like disposed in parallel relation. The

upper portions of the extremities of tlie partition members 11 are-disposed in notches 01' slots 12 in the sides ofthe frame of the mold while the lowerportions of said ends are provided with laterally extending flanges which-are engaged by end plateslii disposed between each pair of partition members 11. The end plates 13 are mounted on transverse retaining elementsl t which are notched at 15 for the reception of the adjacent ends of pairs of partition members 11 and a pair of strips 16 and'17 are carried on. the back of said transverse retaining elements 14, the lower stripf16 of which engages the upper edge of the side of the frame 10 while the upper strip serves as a handle or gripping element by means of which the member 14* may be removed. Separator plates 18 corresponding to theend plates 13 are arranged betweenthe diverging portions of the opposedpartition members-and said partition members are provided with short slots 19 extending downwardly for a short distance fromtheir upper ends for the reception ofextensions 20 formed at the upper outer edge of eachpartition plate. Also a relatively short projection or tongue 21 isprovided' at the bottom of the separator plates which engages a depression or groove 22 in the floor or bottom of the mold. In this manner each separator plate will be held rigidly at its upper and lower ends.

, Around the sides and ends of the nests of molds formed by the partitions and separator plates adjacent the side and end walls of the frame are a number of spaces which it is not desirable to fill with the mixture and in these spaces are provided filler pieces 23 and 2 1 of wood, sheet metal or the like material. The filler pieces 24L are preferably secured to the sides of the frame 10. Additional filler pieces corresponding in shape to filler pieces 23 and 2 l-v are provided at the bottom of the frame for cooperating with the filler pieces 23 and 24: for holding the partition members in proper position.

The end plates 13 prevent the mixture from entering the space below the member 16 and 1 preferably provide a bar 26 at each end of the mold extending across the same in vertically disposed slots 27 in the ends of the partition members 11 and slidable vertically for vibrating or jarring the mold so that the partition members may be readily removed. The bars 26 are provided with upstanding cars 28 for engagement by hooks (after the retaining elements 14 have been removed) for moving the bars to cause the vibration necessary to release the partition members from the blocks after they have partially set and prior to their being subjected to the curing process.

In order to provide means for transporting the mold from place to place I provide a pair of brackets 29 secured on the under side of the mold at the center and support ing the axle 30 upon which are mounted wheels 31. l preferablyprovide one or more legs 32 at each end of the body of the mold. @hviously if desired the wheels and axle need not be attached directly to the bottom of the mold body but a separate truck may be PIOVlClGCl so that the mold may be placed in a pile with other molds and one truck will serve for moving more than one mold. I prefer to have the wheels mounted in the center of the truck body so that the truck may be easilyrocked for agitating the mix ture as it is being poured into the mold to cause it to settle compactly between the forms.

In order to provide a fancy surface to the block, such for example as surface of granite or the like, I provide a saddle 33, saia. saddle comprising a pair of side members having their margins turned over to provide flanges 34: for engagement with the separator plates 18, said side members having integrally formed straps 35 at their upper edges adjacent their ends. With this structure a facing or surface layer of granite or the like may be poured in between the side walls of the saddle to fill the spaces at each side of the separator plate 18 after which concrete may be poured in to fill the ren'lainder of the block and the saddle removed to permit a bonding of the facing layer and the material which forms the body of the block. It will not be necessary to provide a saddle 33 for each partition plate 18 unless it is desired to provide a fancy sure face at each side of the block and thus my device is susceptible to various changes ac cording to the particular type of block desired. 1

As shown in Figures 4 and 5 a concrete block may be made which has its ends provided with interlocking ribs and grooves so that the ends of the blocks may hold each other in proper a'linement in a wall, as shown in Figure 8 block 39 may be formed with plane surfaces free from interlocking ribs and grooves while if desired blocks 4-0 or 41, such as shown in Figures 9 and 10, may be provided by the use of my sheet metal core 42, shown in Figure 12, said sheet metal core being of a shape to fit snugly between the contiguous opposed portions of the partition members 11, the pointed portions of said core l2 conforming to the inclined sides of said contiguous portions.

The core 4-2; will i be frictionally held in place, however, if desired an extension 43 may be provided which Wlll engage the bottom of the mold and limitthe downward'movement of the core and permit concrete to flow around the same. When a block such as shown in Figure 10'is manufactured two cores L2 will be required and the lateral extension 4-3 on the core the greatest distance from the bottom of the mold will engage the core nearest the bottom of the mold whereby said core will be held in position by said lateral extensions. ltn mold ng a block such as shown in. Figure 9 a core split in half is usedonc-half of the same being placed on the bottom of the mold while the other half is used at the top and a complete core is disposed at the center of the mold. In order to render the core 42 readily llltl removable I provide the ends of the same at V a slight distance apart and turned rear-' wardly upon themselves at 43 for engage ment by a connecting element l l having an intermediate portion adapted to fill up the gap between the adjacent ends of the core.

If desired a block maybe provided with complementary end portions for cooperating with similar end portions on adjacent blocks for maintaining the blocks in alinement in a wall, as shown in Figure 10..

It will be understood that my invention comprises arranging a plurality of crimped or particularly shaped partition members formed of relatively thin material in upright spaced position in a frame or box. The par tition members form the outlines of a block. The mold may be constructed to accommodate any desired number of blocks in a manon the other in compact form forshippmg.

I preferably use a wet mixture, pour the same in the mold from the top, thus forming a block of harder and denser character in which it is possible to use the proper amount of gravel or crushed stone, cinders, or other combination of materials as easily as where mere sand and cement are used. After the pouring operation and the setting, the partition members are removed and the frame which is of water-tight construction may be filled with water and the blocks are allowed to set until they are fully cured, thus avoiding the necessity of continuous spray-.

ing or wetting the blocks or steam curing.

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention and therefore I do not limit myself to what is shown in the drawings and described in the specification but only as indicated in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. A mold comprising a frame or. box, a plurality of partition members disposed in parallel relation in said box with substantially parallel opposed portions disposed at different distances from'each other in alternate relation, and separator plates between the substantially parallel opposed portions spaced the greater distance apart, substantially as set forth.

2. A mold comprising a frame or box, core members disposed along the sides of the box and having inwardly projecting portions spaced along the same, reenforeing blocks disposed behind said'inwardly projecting portions, a plurality of opposed par tition members having portions projecting outwardly and inwardly in alternate relation, and separator plates disposed between said alternate outwardly extending portions and forming substantially H-shaped spaces, substantially as set forth. I

3. A mold comprising a frame or box, a plurality of partition members disposed in upright spaced relation in said box, end plates disposed transversely between said first-mentioned partitions forming a nest of molds having reversed parts with the centers of one line forming the edges of the next line, substantially as set forth.

4c- A mold comprising a frame or. box, a plurality of partition members disposed in upright spaced relation in said box, end plates disposed transversely between said first-mentioned partitions forming a nest of molds having reversed parts with the centers of one line forming the edges of the plates disposed next line, and a pair of side plates integrally connected at their upper ends and having inturned' flanges for engagement with certain of said partition members for providing a block with a surface of a different character, substantially as set forth.

5. A mold comprising a frame, a plurality of partition members disposed transversely therein, a plurality of separator plates between said partition members said partition 'members having their ends provided with slots, and a bar extendingtransversely within said slots, said bar being adapted to be operated for jarring the partition members loose from the box, substantially as set forth.

6. A mold comprising a frame or box, a plurality of partition members disposed in upright spaced relation in said box, end transversely between said first-mentioned partitions forming a nest o molds having reversed parts with the centers of one line forming the edges of the next line, the extremities of said partition members being provided with flanges extending behind said end plates, substantially as set forth.

7. A mold comprising a frame or box, a plurality of partition members disposed in upright spaced relation in said box, end plates disposed transversely between said first-mentioned partitions forming a nest of molds having reversed parts with the centers of one line forming the edges of the next line, and means for supportingsaid end plates comprisinga bar arranged to fit over the ends of said partition members and having notches therein permitting said support to project downward into said box for fas- I tening the end plates thereto, substantially as set forth.

8. A mold comprising a frame or box, a plurality of partition members disposed in upright spaced relation in said box, end plates disposed transversely between said first-mentioned partitions forming a nest of molds having reversed parts with the cen ters of one line forming the edges of the next line, and filler pieces corresponding to the extremity of a half section of a block disposed on two sides of said box, and filler pieces corresponding to the hollow side of the box disposed on the other two sides of the box, substantially as set forth.

9. A mold comprising a frame or box, a plurality of partition members disposed in upright spaced relation in said box, end plates disposed transversely between said first-mentioned partitions forming a nest of molds having reversed parts with the centers of one line forming the edges of the next line, and means for bracing said separator plates against lateral movement said means comprising tongue and groove connection between said separator plates and said box, substantially as set forth.

10. The combination with. a partition for Wardly to form flanges arranged to engage determining the extremities 01. two cement the partition member and hold said plates 15 V blocks of means for providing the extremity spaced, substantially as set forth. of each oli said blocks With a surface of dif- In Witness whereof, I have hereunto set 6 ferent character comprising a pair of spaced my hand at Washington, District of Columplates connected at their upper ends by bia, this ninth day of Septcmben AL D. ninestraps fol'lned integrally with said plates, teen hundred and twenty-six. the edges of said plates being turned in- WILLIAM A. THREADGILL. 

